"Uncaught TypeError: document.getElementById(...) is null" Error in JavaScript [duplicate]

I am currently learning JavaScript and I have a problem in my function(s). It's a code that convert a specific amount of EUR / USD / YEN in the other currencies and paste them in a table. I'll paste the css-code too for the optics.

Important: The Program is not finished yet, you need to start the function in your browser console, it won't work automatically Example for the console:

EURUmrechnen(amount)

function EURInUSD(EUR) { /* The calculation of the currencies */
  return EUR * 1.0537;
}

/* --- */

function EURInYEN(EUR) {
  return EUR * 135.277;
}

/* --- */

function USDInEUR(USD) {
  return USD * 0.9485;
}

/* --- */

function USDInYEN(USD) {
  return USD * 127.7625;
}

/* --- */

function YENInEUR(YEN) {
  return YEN * 0.007393;
}

/* --- */

function YENInUSD(YEN) {
  return YEN * 0.007826;
}



function EURUmrechnen(EUR) { /* This EUR-Calculator works as it should. */
  document.getElementById("USD-Eingabe").value = EURInUSD(EUR);
  document.getElementById("YEN-Eingabe").value = EURInYEN(EUR);
}

function USDUmrechnen(USD) { /* USD and YEN Calculator give the Error you can find in the title. */
  document.getElementById("EUR-Eingabe").value = USDInEUR(USD);
  document.getElementById("YEN-Eingabe").value = USDInYEN(USD);
}

function YENUmrechnen(YEN) {
  document.getElementById("EUR-Eingabe").value = YENInEUR(YEN);
  document.getElementById("USD-Eingabe").value = YENInUSD(YEN);
}

.Umrechner {
  display: flex;
  justify-content: center;
  align-items: center;
}

.Eingabefeld {
  display: flex;
  flex-direction: column;
  margin: 0px 16px;
  border: 1px solid #dadada;
  max-width: 25%;
}

.Umrechner input {
  border: none;
  border-bottom: 1px solid #dadada;
  appearance: textfield;
}

.Umrechner input:focus {
  outline: none;
}

.Umrechner input,
.Umrechner label {
  padding: .5em;
  text-align: center;
}

.Umrechner * {
  font-family: sans-serif, "Arial", "Helvetica";
  font-size: 1.5rem;
}

<!DOCTYPE html>
<html lang="de">

<head>
  <meta charset="UTF-8">
  <link rel="stylesheet" href="style.css">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Umrechner</title>
  <script src="scripts.js" defer></script>
</head>

<body>
  <div class="Umrechner">

    <div class="Eingabefeld">
      <input type="number" step="any" id="Euro-Eingabe">
      <label for="Euro-Eingabe">Euro</label>
    </div>
    <div class="gleichzeichen">=</div>

    <div class="Eingabefeld">
      <input type="number" step="any" id="USD-Eingabe">
      <label for="USD-Eingabe">USD</label>
    </div>
    <div class="gleichzeichen">=</div>

    <div class="Eingabefeld">
      <input type="number" step="any" id="YEN-Eingabe">
      <label for="YEN-Eingabe">YEN</label>
    </div>


  </div>
</body>

</html>

Thanks for your help!

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